LABORATORY TECHNICIAN TRAINING
Weighing and Measuring Techniques
LTWEM
Formats: Video, Digital Video on Demand
 

OVERVIEW

This unit presents material related to weighing and measuring techniques commonly performed in laboratories. It begins by describing the operation of two types of instru­ments used to make mass measurements: mechanical and electronic balances. Then the techniques of reading various volumetric measuring devices including graduated cylin­ders, pipettes, and burettes are demonstrated. Next, the unit presents demonstrations of how to make linear measurements using calipers and a measuring microscope. The unit concludes with a segment on temperature measurements that describes the techniques used to read alcohol and mercury thermometers and to check the accuracy of liquid-filled thermometers.

 

OBJECTIVES

 

Mass Measurements

·         Explain the difference between mass and weight.

·         Explain the physical principles behind the operation of a typical mechanical balance.

·         Describe how a typical electronic balance operates.

·         List factors that can affect the accuracy of a mass measurement.

 

Volumetric Measurements

·         Explain in general how volumetric measuring devices are read.

·         Describe or demonstrate how to use a volumetric flask, a graduated cylinder, a pipette, a burette, and a syringe.

 

Linear Measurements

·         Explain how calipers can be used to make linear measurements.

·         Explain how a measuring microscope can be used to make linear measure­ments.

 

Temperature Measurements

·         Convert temperature readings between the following scales: Fahrenheit, Celsius centigrade, and Kelvin.

·         Explain how alcohol thermometers and mercury thermometers are read.

·         Explain how to check the accuracy of a liquid-filled thermometer.

 

SUBJECTS

 

Mass Measurements

·         Weight And Mass

·         Balances

o        Mechanical Balances

o        Electronic Balances

·         Factors That Can Affect Mass Measurements

 

Volumetric Measurements

·         Reading Volumetric Measuring Devices

·         Volumetric Flasks

·         Graduated Cylinders

·         Pipettes

·         Burettes

·         Syringes

 

Linear Measurements

·         Calipers

·         Measuring Microscopes

 

Temperature Measurements

·         Temperature Scales

·         Reading Liquid-Filled Thermometers

·         Checking The Accuracy Of A Liquid-Filled Thermometer